Aimee Garcia gets nervous every time she is handed a script on the Showtime serial killer drama “Dexter.” Why? Because she never knows if it will be her last.

The Fenwick High School alum — who plays Jamie Batista, nanny to Dexter’s son Harrison and sister to detective Angel Batista — has seen character after character get killed off during the show’s six seasons. She’s aware she could always be next.

“Even if I have an avocado face mask on, I’ll run out when the script comes and snatch it from the messenger and look through it,” Garcia said over the phone from Los Angeles last week. “My friends are always like ‘Are you getting killed off?’ and I’m like ‘I don’t know yet. And even if I did, I wouldn’t tell you.’

“I definitely get nervous. I’m in my second year now (with the show) and feel my heart pitter-patter when I read the script because they don’t tell you anything.”

Most of the cast didn’t know about the cliffhanger at the end of Season 6 until the audience did, according to Garcia. The seventh season of the show — which stars Emmy-winner Michael C. Hall as a Miami blood spatter analyst-by-day, serial killer-by-night — premieres Sunday.

Garcia said she was a fan of the show even before she came aboard as the new nanny in Season 6 (don’t ask Garcia about the unexplained exit of the previous nanny — she doesn’t know ). And yet, she wasn’t nervous for her first day on set, except for her first scene, which required her to wear a bikini.

“I was more worried about that than anything,” Garcia said. “I was like ‘God, I hope I look good. I hope my butt doesn’t look big.’”

Long before “Dexter,” Garcia was appearing in McDonald’s commercials with Chicago sports stars Michael Jordan and Sammy Sosa and auditioning for the lead role in the biopic of late Tejano singer Selena. She was one of the finalists for the 1997 film but was deemed too young and lost out to Jennifer Lopez.

Garcia attended Northwestern University, where she majored in economics, journalism and French. She moved to Los Angeles afterward knowing she had an offer from Morgan Stanley in New York if things didn’t work out, but landed a small role on 2002’s “The Good Girl” with Jennifer Aniston within seven days. She later landed the role of the narrator on 2004’s “Spanglish” with Adam Sandler and joined the cast of ABC’s “George Lopez.”

On Sept. 22, Garcia was scheduled to begin her first day on the set of the “RoboCop” reboot. Garcia will play a scientist who helps Gary Oldman’s character bring RoboCop to life.

And what can we expect from Garcia’s character on the upcoming season of “Dexter”?

“I think (Jamie) has grown to love Harrison more than ever and has really become a part of Dexter’s nuclear family,” Garcia said. “She’s essentially a mother figure for Harrison. ... And she’s got that creepy boyfriend (Louis). You never know what will happen there – especially on a show like this.”

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